Objective:

To assess whether retinal blood-flow autoregulation can serve as an early biomarker for glaucoma, potentially improving early detection before structural damage or vision loss occurs.

Key Findings:

• Control patients showed a mean blood flow decrease of over 10% under hyperoxia, while mild POAG patients demonstrated a smaller decrease, indicating reduced autoregulatory responsiveness, which may have implications for monitoring disease progression.
• Secondary indices like resistivity index and volumetric skew showed larger changes in controls compared to glaucoma patients, suggesting impaired autoregulation in glaucoma, which could inform future diagnostic criteria.
• Some measures in glaucoma suspects resembled early glaucoma more than controls, indicating altered autoregulation may appear before visual field damage, highlighting the need for early intervention.

Interpretation:

The study suggests that impaired retinal blood flow autoregulation may serve as an early physiological marker for glaucoma, potentially supplementing traditional structural and functional assessments, and changing how we approach early detection.

Limitations:

• The study is cross-sectional and may not establish causality, which limits the ability to draw definitive conclusions about the relationship between autoregulation and glaucoma progression.
• Sample size and demographic limitations may affect generalizability, suggesting the need for larger, more diverse studies to validate findings.

Conclusion:

Retinal blood flow autoregulation could be a promising early indicator for glaucoma, warranting further investigation to enhance early detection strategies and improve patient outcomes.